When part of the home can’t be heated
No heat in some rooms can still be a habitability problem, especially if it affects rooms you need to use, like bedrooms. Maintaining a heating system that warms the whole unit is generally the landlord's responsibility.
When only part of the home lacks heat, the cause may be a blocked or disconnected vent, a broken heating zone, or ductwork problems — things the landlord must repair. A bedroom or main living area that cannot be heated is a real problem, even if other rooms stay warm.
Report which rooms are affected and which are fine, since that detail helps identify the cause. Do not let a landlord brush it off just because the living room is warm if you cannot heat where you sleep. If your landlord ignores rooms that cannot be heated, a free review can help you understand your options.
This is general information about California tenant rights, not legal advice. Every situation is different.